Non-destructive testing (NDT) is a testing and analysis technique used by industry to evaluate the properties of a material, component, structure or system for characteristic differences or welding defects and discontinuities without causing damage to the original part. NDT also known as non-destructive examination (NDE), non-destructive inspection (NDI) and non-destructive evaluation (NDE).

The essential feature of NDT is that the test process produces no deleterious effects on the material or structure of articles under test.

What methods were usually used in steel PIPING manufacture?

1.(RT)radiation , such as X-rays, neutrons or gamma radiation.

This is a well-established technique which gives a permanent record and is widely used to detect internal flaws in weldments and castings and to check for mis-constructions in assemblies.

2.(UT)ultrasonic testing;

Ultrasonic testing techniques are widely accepted for quality control and materials testing in many industries.

3.(PT)Penetrant testing

PT is a simple low-cost method of detecting surface-breaking flaws such as cracks, laps, porosity, etc. To be detected, the flaw must reach the surface to be tested.

4.(MT)Magnetic particle testing

MT is applicable to all metals which can be strongly magnetised – ferritic steels and irons, but not generally austenitic steels.Such as alloy steel, carbon steel and low temperature steel.


NDT is a really important part in the manufacturing process of steel pipes, pipe fittings and other fabricated products.


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